Submission #222941

#	Time	Username	Problem	Language	Result	Execution time	Memory
222941		ngot23	Deda (COCI17_deda)	C++11	0 / 140	1078 ms	5368 KiB

deda

#include <bits/stdc++.h>

using namespace std;
const int N=200005;
int t[N*4], n, Q, ID[N*4];

void build(int l, int r, int id) {
    if(l==r) {
        ID[l] = id;
        t[id] = 1e9 + 1;
        return;
    }
    int mid=(r+l)>>1;
    build(l, mid, id*2);
    build(mid+1, r, id*2+1);
}

void update(int u, int val) {
    u=ID[u];
    t[u]=val;
    while(u/2!=0) {
        int id=u/2;
        t[id]=min(t[u], t[u^1]);
        u = id;
    }
}

int get(int l, int r, int id, int u, int v) {
    if(v<l || r<u) return int(1e9+1);
    if(u<=l && r<=v) return t[id];
    int mid=(r+l)>>1;
    return min(get(l, mid, id*2, u, v), get(mid+1, r, id*2+1, u, v));
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if(fopen(".inp", "r")) freopen(".inp", "r", stdin);
    cin >> n >> Q;
    build(1, n, 1);


    for(int i=1 ; i<=Q ; ++i) {
        int c, d; char x;
        cin >> x >> c >> d;
        if(x=='M') {
            update(d, c);
        } else {
            int l=d-1, r=n+1;
            while(r-l>1) {
                int mid=r+l >> 1;
                if(get(1, n, 1, d, mid) <= c) r=mid;
                else l=mid;
            }
            if(r==n+1) r=-1;
            cout << r << '\n';
        }
    }


    return 0;
}

Compilation message (stderr)

deda.cpp: In function 'int main()':
deda.cpp:50:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
                 int mid=r+l >> 1;
                         ~^~
deda.cpp:37:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     if(fopen(".inp", "r")) freopen(".inp", "r", stdin);
                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 140